If left untreated, it can cause liver damage and ultimately be rapidly fatal.

Daniella Dos Santos, junior vice president of the association, said: “We know that some dogs enjoy nothing better than a paddle in a cool lake while on a walk during summer months, but my advice to pet owners would be to keep your dog on a lead during walks near water confirmed to have toxic algal blooms.

"While not all blue green algae are poisonous, it is impossible to tell the difference visually, so it is better to be safe than sorry.

“There is currently no known antidote for the toxins, so prompt veterinary treatment is essential to tackle their effects and ensure a good chance of recovery.

"If you suspect your dog has been exposed to blue green algae, rush it to your local vet without delay."

A spokesperson for Wakefield Council said that the park is continuing to monitor the levels of algae in the water and would issue a statement when the lake is reopened.

In 2016, the lake remained closed for several days after green algae was spotted on the water. High levels of bacteria were also found in the water during routine testing in 2018.

Advice from the government warns that algal blooms can form in the sea, lakes and rivers.

You cannot tell if a bloom is toxic just by looking at it, and people are asked to assume that blooms are toxic, keep pets and children away from the water and avoid skin contact with the water or algae.